| VUV/TiO_2/O_3去除水中微量硝基苯的研究 |
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| 引用本文： | 尹菁菁,张彭义.VUV/TiO_2/O_3去除水中微量硝基苯的研究[J].环境科学,2009,30(1). |
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| 作者姓名： | 尹菁菁 张彭义 |
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| 作者单位： | 清华大学环境科学与工程系,北京,100084 |
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 采用负载在钛片上的二氧化钛(TiO2)薄膜光催化剂,以能发射185 nm真空紫外线(VUV)的紫外灯为光源,研究臭氧强化的真空紫外光催化方法(VUV/TiO2/O3)对水中微量硝基苯的去除效果.结果表明,VUV/TiO2/O3是一种有效地去除水中微量硝基苯的方法,VUV/TiO2/O3的表观一级反应速率常数比UV/TiO2/O3和VUV/O3分别高102.8%和30.8%,去离子水中50 μg/L的硝基苯反应60 s后就降低到检测限以下.VUV/TiO2/O3对硝基苯的降解速率随臭氧投加量的增加而显著增大,臭氧投加量1.52 mg/L时的反应速率比不加臭氧时提高了134.4%;虽然表观一级反应速率常数随初始浓度增加而稍有下降,但初始浓度170 μg/L的硝基苯反应2 min后也无法检出.水中常见的重碳酸盐和腐殖酸对硝基苯降解有显著的抑制作用,两者浓度分别为2 mmol/L和3.2 mg/L时,VUV/TiO2/O3对硝基苯的表观反应速率常数分别下降82.9%和71.6%,反应速率常数的倒数与重碳酸氢根浓度线性相关.VUV/TiO2/O3能快速有效地去除地表水(含碳酸盐和天然有机物)中的微量硝基苯,4 min内初始浓度为90 μg/L的硝基苯去除率达到96%,UV254降低了80%.
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| 关 键 词： | 真空紫外光 光催化 臭氧 硝基苯 重碳酸根 腐殖酸 微污染物 |
Removal of Trace Nitrobenzene in Water by VUV/TiO_2/O_3 |
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| YIN Jing-jing,ZHANG Peng-yi.Removal of Trace Nitrobenzene in Water by VUV/TiO_2/O_3[J].Chinese Journal of Environmental Science,2009,30(1). |
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| Authors: | YIN Jing-jing ZHANG Peng-yi |
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| Institution: | Department of Environmental Science and Engineering;Tsinghua University;Beijing 100084;China |
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| Abstract: | The removal of trace nitrobenzene in water by the ozone-enhanced VUV photocatalysis process(VUV/TiO_2/O_3) was investigated,in which low-pressure mercury lamp emitting 185 nm vacuum ultraviolet and titanium dioxide film coated on the titanium plate were used as light source and photocatalyst respectively.The results show that,VUV/TiO_2/O_3 is an effective method to remove trace nitrobenzene in water,and the pseudo-first-order rate constant of nitrobenzene in the VUV/TiO_2/O_3 process is 102.8% and 30.8% hig... |
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| Keywords: | vacuum ultraviolet photocatalysis ozone nitrobenzene bicarbonate humic acid micro-pollutant |
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